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The experiment
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The next experiment may seem counterintuitive, but it is very worthwhile. We are going to be measuring albedo radiation. Using your solar setup, point your PV panel at the floor and take a measurement (Figure 10-34). What did you expect A zero reading In fact, as you can see, there is still a lot of energy in indirect radiation which is reflected from other surfaces. We saw in the last experiment how bifacial solar cells are able to collect the solar energy reflected from two faces. Therefore, in the covered walkway they can collect energy reflected from the ground (albedo) as well as from direct radiation.
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day or night. The power is stored locally in batteries located in the foundation of the sign. In addition to powering devices in remote locations with no access to the power grid, we can also construct large photovoltaic arrays, which generate a significant quantity of electricity which can be fed into the grid when it is not being used onsite. The great thing about photovoltaic cells, is that they can be used in place of things like roof tiles and shingles so although we cover the building with photovoltaic cells, which are expensive, we save on the cost of the roofing material.
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Figure 10-35 The HEESI satellite powered by solar power. Image courtesy NASA.
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We can see how a solar array can be made plain and large as in this solar array at the Centre for Alternative Technology, U.K. (Figure 10-37). Or with a little bit of thought, they can be integrated creatively into the building fabric as shown in Figure 10-38.
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Producing electricity by photovoltaic cells is fairly expensive compared to other types of generation. However, when considering the cost of solar energy, figure in all of the carbon emissions that you aren t producing, and the toxic waste that you aren t making. We now know that solar cells can be used to generate electricity, but the problem is getting it in a form that we can use in our homes. Sure, it is possible to run a few simple bulbs from a DC supply, but to run most of our household appliances, we need to generate electricity in a form that is suitable for them AC. You will notice that the output from all of our solar cells is direct current (see Figure 10-39). The voltage is always a fixed polarity with reference to 0 V. We can couple solar cells in series to produce a higher voltage, or in parallel to produce
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Figure 10-36 A road sign powered by renewable energy.
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Figure 10-37 The 11 kW solar array at the Centre for Alternative Technology, U.K.
Figure 10-38 Photovoltaic cells creatively integrated into a building fabric. Image courtesy Jason Hawkes.
Figure 10-39 Direct current.
Figure 10-40 Alternating current.
a higher current, but we are always going to end up with DC. By contrast, in our homes, our appliances and devices require alternating current, AC (Figure 10-40). We see how the AC waveform differs dramatically from the steady DC line. In the United States, the frequency of this AC supply is 60 Hz, in the U.K. it is 50 Hz, it is also at a higher voltage (120 V in the U.S.A., and 230 V in the U.K.).
into AC high voltage The answer is that we use an inverter. An inverter is a piece of electronics (Figure 10-41), which takes the DC supply from our solar cell and generates an AC waveform at the correct voltage and frequency for our items of mains equipment. We need some extra devices for safety reasons, you will see in the setup that there is a mains isolator switch (as shown in Figure 10-42). This allows us to disconnect the mains from the inverter
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So, how can we take the power from our photovoltaic cells, and turn it from DC low voltage
Figure 10-41 A typical inverter setup.
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Figure 10-42 Mains isolator switch.
Figure 10-43 Mains circuit breaker.
in the event that we need to carry out work or maintenance. We also need to include a mains circuit breaker to protect against overcurrents or surges, which could be potentially damaging and dangerous. A circuit breaker is shown in Figure 10-43. And in addition, we need to be able to isolate the DC supply coming from our solar array. A DC isolator switch is shown in Figure 10-44. It is also interesting to see how much energy our solar array is producing. This can be useful for accounting purposes, say if we are selling the solar energy back to the grid, or simply to benchmark the performance of our solar system and see if it is in line with our design predictions. A watt hour meter is shown in Figure 10-45.
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